Prosecutors said Friday they will seek the death penalty against a man accused of stabbing a 19-year-old woman to death at Oklahoma City's downtown bus station.

Isaiah Glenndell Tryon

Isaiah Glenndell Tryon, 23, of Oklahoma City, is charged with first-degree murder in the March 16 death of Tia Bloomer, 19. Bloomer was stabbed multiple times in front of dozens of witnesses.

The killing was captured on surveillance video. Bloomer was on her way to file a protective order against Tryon when she was killed, authorities said.

Prosecutors allege in a bill of particulars filed Friday in Oklahoma County District Court that the killing “was particularly heinous, atrocious or cruel,” and believe Tryon is a threat to society who would commit additional “criminal acts of violence” if released.

Tryon waived his preliminary hearing last month. He is due back in court in January.

Police and court records show Tryon is the father of Bloomer's 2-year-old child and had a history of violence toward her. He was serving a deferred sentence after pleading guilty in November 2011 to abusing Bloomer and also was accused of firing a gun at her in 2010 while she was holding their child.

Quennin Tillman, of Oklahoma City, a witness to the killing, said he had just come out of the restroom inside the transit hub's main building at 420 NW 5 when he heard a woman scream before she fell face down just inside the building's front entrance.

“He laid on her back and stabbed her 15 to 20 times that I saw,” Tillman said. “There were so many people, no one could get in to help.”

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Tim Willert is a native Californian with Oklahoma ties who covers education. Prior to moving to Oklahoma in June 2011, he was as an editor for FOXSports.com in Century City, Calif., and reported on courts for the Los Angeles Daily Journal and...